High-sensitivity CW Fabry-Pérot enhanced spectroscopy of CO2 and C2H2 using a 1064-nm Nd:YAG laser

E. Inbar*, A. Arie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated the weak absorption lines of CO2 (2003 ← 0000) R(6), C2H2 (2100011 ← 0000000) R(12), and C2H2 (1200031 ← 0000000) P(6) near 1064 nm using CW cavity ring-down spectroscopy and CW cavity transmission. An effective interaction length of more than 30 km was achieved (cavity finesse ≈ 86 000) and the sensitivity was ≈ 10-8 cm-1. Higher sensitivity of 3.3 × 10-11 cm-1/√Hz was obtained by cavity-enhanced wavelength modulation spectroscopy. The absorption coefficients, pressure broadening coefficients, lineshapes, line strengths, and absolute wavelengths of those lines were determined, some of them for the first time. The measurements were carried out over a wide range of pressures from the strongly inhomogeneous to the strongly homogeneous region.

Original languageEnglish
Pages (from-to)99-105
Number of pages7
JournalApplied Physics B: Lasers and Optics
Volume68
Issue number1
DOIs
StatePublished - 1999

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